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Accrued Workers' Compensation Cost - (Notes)
 9 Months Ended
Sep. 30, 2019
Insurance [Abstract]  
ACCRUED WORKERS' COMPENSATION COSTS ACCRUED WORKERS' COMPENSATION COSTS
The following table summarizes the accrued workers’ compensation cost activity for the three and nine months ended September 30, 2019 and 2018:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(in millions)
2019
2018
 
2019
2018
Total accrued costs, beginning of period
$
224

$
244

 
$
238

$
255

Incurred
 
 
 
 
 
Current year
19

20

 
54

59

Prior years
(6
)
(4
)
 
(22
)
(17
)
Total incurred
13

16

 
32

42

Paid
 
 
 
 
 
Current year
(5
)
(6
)
 
(8
)
(8
)
Prior years
(11
)
(9
)
 
(41
)
(44
)
Total paid
(16
)
(15
)
 
(49
)
(52
)
Total accrued costs, end of period
$
221

$
245

 
$
221

$
245

The following summarizes workers' compensation liabilities on the condensed consolidated balance sheets:
(in millions)
September 30, 2019
December 31, 2018
Total accrued costs, end of period
$
221

$
238

Collateral paid to carriers and offset against accrued costs
(12
)
(13
)
Total accrued costs, net of carrier collateral offset
$
209

$
225

Payable in less than 1 year
(net of collateral paid to carriers of $3 and $3 at September 30, 2019 and December 31, 2018, respectively)
$
63

$
67

Payable in more than 1 year
(net of collateral paid to carriers of $9 and $10 at September 30, 2019 and December 31, 2018, respectively)
146

158

Total accrued costs, net of carrier collateral offset
$
209

$
225


Incurred claims related to prior years represent changes in estimates for ultimate losses on workers' compensation claims. For the three and nine months ended September 30, 2019, the change was primarily due to a decrease in estimate of ultimate losses related to older plan years and the recognition of current year development of ultimate losses.
As of September 30, 2019 and December 31, 2018, we had $56 million and $57 million, respectively, of collateral held by insurance carriers of which $12 million and $13 million, respectively, was offset against accrued workers' compensation costs as the agreements permit and are net settled against collateral held.